very pleased with libreelec but it was missing zerotier. Though possible with docker (I am not willing to install third-party unvetted stuff - sorry)...
I therefore started to copy files from my existing raspi 3. All works fine. Thx libreelec devs!
Made a gist see:
External Content
gist.github.com
Content embedded from external sources will not be displayed without your consent.
Through the activation of external content, you agree that personal data may be transferred to third party platforms. We have provided more information on this in our privacy policy.